Matrix bar



Nav, 25, 1924.

J. DORNETH MATRIX BAR Filed April 7, 1924 Patented Nov. 25, 1924.

UNITED STATES PATENT oFElcE.

JULIUS DO'RNETH, OF KONRADSHOHE, NEAR' TFGEL, GERMANY, ASSIG-NOR TO THE FIRM TYPOGRAIPH GESELLSCHAFT IVI. B. H., OF BERLIN, PRUSSIA., GERMANY.

MATRIX BAR.

.Application filed April '7,

To aZ-Z r11/0m 'it may conce/1%;

Be it known that I, JULIUs DORNETH, engineer, a citizen of Germany, and residing at Konradshohe, near rlfegel, Germany, have invented certain new and useful mprovements in Matrix Bars, of which the 'following is a specification.

The subject of this invention is a two-part matrix bar for matrix setting and line casting machines, the parts of which bearing the characters and the suspending eye respectively are slidable with respect to one another and are guided relatively by means oi: slots andA pins. As regards durability the constructional form, which has hitherto proved to be the best, is that in which one of the parts is milled out from the top and from one of the narrow sides, so that in cross-section it forms a U-shaped groove for guiding the other part. It has, however', been 1found that even this form of construction, more particularly in the case ot small characters, is too thick, as at the connecting place there are three thicknesses next to one another. It is of course possible to form a guide with slots and pins, in which there are only two thicknesses, but hitherto it has not been possible to make this constructional form strong enough, as the pins must lit so accurately in the slots that the parts shall neither move relatively to one another in the direction of their planes nor be capable of separating from one another.

The present invention renders it possible, by the provision of a guiding pin and a slot on each of the two parts, which are slidable relatively to one another, to obtain sufficient rigidity with only two thicknesses.

In the accompanying drawing a constructional forni of the invention is shown to an enlarged scale.

Figs. l and 2 being two views of the 1924. Serial No. 704,884.

mailzrix bar pushed together and extended an Fig. 3 a longitudinal section on line A-B of Fig. 2.

o and b are the two relatively slidable parts, of which the part o carries the suspending eye and the part b the characters.

rlhe part a is provided with a guiding slot c and on its under side with a guiding pin (l, while the part l) is similarly provided with a pin c and a. guiding slot f. Then the matrix bar is extended as in Fig. 2, the pins c and Z are sufciently far apart to withstand the stresses occurring with the parts in this position. The more the two parts of the bar pushed together, the greater will be the distance between the two pins (see. Fig. l) and the less will be the danger ot the parts being displaced relatively to one another in their plane and of their being separated one from another.

Obviously the pin d on the part t might be above the slot e and conversely the pin c on the part Z7 might be below the slot f. In this case the dist-ance between the pins would be the greatest, when the bar is extended.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, declare that what claim is ln a matrix bar, a part bearing the characters, and a second part bearing the suspending eye, each of the two parts being provided with a guiding slot and a pin for the pin and guiding slot of the other part.

In testimony whereoiI l hereunto affix my signature in the presence of two witnesses.

JULIUS DORNETH. llfitnesses VVIGAND HEINIG, MARTA BRSBERG. 

